Electrical-switching apparatus



Jam-8 1924.

1,480,306 w. M. SCOTT ELECTRICAL SWITCHING APPARATUS Filed Oct. 2, 19194 Sheets-Sheet I A TTORNE) Jan. 8 1924.

W. M. SCOTT ELECTRICAL SWITCHING APPARATUS Filed Oct. 1919 4Sheets-Sheet 2 W L /A/WM SCOTF Jan; 8, 1924. 1,480,306

w. M. SCOTT ELECTRICAL SWITCHING APPARATUS Filed Oct. 2, 1919 4sheets-sheet s INVENTOR.

W/L L MM M. 560 7'7.

Jan. 8, 1924. 1,480,306

w. M. SCOTT ELECTRICAL SWITCHING APPARATUS Filed Oct. 2, 1919 4Sheets-Sheet 4 INVENTOR YMLMA M Mia Qfi/K ZZATTORNEY Patented Jan. 8,1924.

UNITED STATES PATENT OFFICE.

ELECTRICAL-SWITCHING APPARATUS Application filed October 2, 1919. SerialNo. 328,056.

To all whom it may concern:

Be it known that I, WILLIAM M. Soon, a citizen of the United States,residing at Tredyfl'rin Township, in the county of Chester and State ofPennsylvania, have invented a certain new and useful Electrical-SW'itching Apparatus, of which the following is a specification. I

My invention relates to circuit breakers and switches in which resettingby hand contact with the switch lever arm is or in which the arm isinaccessible.

The main purpose of my invention is to provide resetting means adaptedto reset either of a pair of circuit breaker armsor switch arms andcomprising structure movable across their planes of movement.

An object of my invention is to provide in a housing, which may belocked against unauthorized entry, automatic circuit breaker mechanism,operable from the exterior of the housing and preferably of theso-called double arm type comprising independently or alternatelyoperable switch'arms restrained in normal or circuit closing position bylatching or equivalent means and automatically tripped byelectro-magnetic means.

Furtherpurposes are to provide resetting means which can bc'mounted infront of the circuit breaker or switch; which will operate upon twocircuit breakers or switches by successive movements, preferably inreverse directions, the one resetting movement being sharplydistinguished from the other; Which is biased toward and returnsautomatically to a neutralposition; which may be locked in this positionto prevent accidental or unautho ized operation; which may be mounted uon or operate through the door of a circuit breaker or switch box, sothat it may be operated without necessity for 01 ening the door; andwhich may preferably be swung away from its operating position to permitfull access to the circuitbreakers or switches controlled by it.

lVhere the resetting mechanism is mounted upon or operates through acircuit breaker door or switch box door, further purposes are toindicate the positions of the reakers or switches and to insure completeof the casing 11.

closure of the door with reliable locking, free from direct strain uponthe lock.

Further purposes will appear in the specification and in the claims.

I have preferred, to illustrate my invention by but one form amongvarious varieties thereof, selecting a form which has proved to bepractical, efficient and reliable and which at the same time Wellillustrates the principles of my invention. dangerous I In thispreferred form Figure 1 is a side elevation of a circuit breaker towhich my invention is applied, the cover being broken away.

Figure 2 is a front elevation of the same construction with the coverbroken away.

Figure 3 is an enlarged side elevation of the circuit breaker and one ofthe operating arms. 1

Figure 4 is an enlarged front elevation of thecircuit breaker and thetwo operating arms.

Figures 5 and 6 are a front elevation and a side elevation respectivelyof my visual indicator. I

Figure 7 is a rear elevation of the indicator in position upon the doorwith part of the door broken away.

Figures 8, 9 and 10 are a front elevation, a side elevation and a bottomplan view respectively of a locking hook for the door.

Fig. 11 is a diagrammatic view of the circuit arrangement of the switchmembers.

In the drawings similar numerals indicate like parts. a

The metal casing or housing 11 is secured by'screws 12 to a wall, beamor other preferably fixed member and supports the entire structureincluding the circuit breaker mechanism and its housing. The base 13, ofslate or other suitable insulating material, is secured to the casing 11by screws 14, the base 13 forming in effect the frckrt wall Leading tothe top and bottom walls of the casing 11 are the conduits 15 and 15having screw threaded ends extending through apertures in the end walls11 and 11 and held in fixed rela- Upon the front of the base 13 aremounted two breaker mechanisms A and B of a so called double arm circuitbreaker mechanism. These two arms may be and preferably are, asillustrated, similar in structure, and therefore a description of onewill suffice for the other, the parts in arm B corresponding to those inarm A having referonce characters similar to those in arm A with theaddition of prime marks.

Referring to the arm A, it comprisesthe vmain upper and lower terminalblocks 1 and 2 normally engaged and bridged by the movable laminatedcontact member 3 carried by the arm 21, the latter carrying also themovable shunt carbon contact 4 cooperating with the stationary shuntcarbon contact 5,

the contact 4 separating from contact 5 after the bridging member..3separates from the main terminals, the final are taking place betweenthe contacts 4 and 5 as well understood in the circuit breaker art.

Conductors 16 and 16, of the supply circuit, for example, are disposedin the conduit 15 and connect, respectively, with the studs 19 and 19'which secure the main terminals 1 and 1 of the two arms A and B upon thebase 13 and form electrical con-I with and securing the lower mainterminal of the breaker arm B on the base 13is the stud 20 with whichconnects the other consumption circuit conductor 17, also disposed inthe conduit 15.

It will accordingly be understood that the circuit through the arm A isfrom conductor 16, through stud 19, upper terminal block 1, bridgingmember 3, lower terminal block 2, through the winding of theelectromagnet 32 to stud 20 and thence to one side of the consumptioncircuit through conductor 17. And the circuitfrom the other supplycircuit conductor 16' extends through the stud 19' tothe upper terminal1' of arm B through its bridging member 3' to its lower terminal block 2through stud 20 and'conductor 17 to the other side of the consumptioncircuit. Accordingly the breakers A and B are in series, respectively,with opposite sides of the circuit which they control, as wellunderstood in the art respecting double arm circuit breakers.

The laminated bridging member 3 is carried by the arm 21 pivoted at 22upon abracket secured to the base 1. The arm 21 is operated by a togglecomprising the link 23 pivoted upon the base at 24 and at 26 1,4so,eoe

to the link member 25, which in turn is pivoted at 27 to the aforesaidarm 21. In the circuit closing position indicated in Fig.

.1, the pivot 27 is slightly below the imaginary line joining thecenters of pivots 27 and 26, and the toggle is therefore under-set.

It is prevented from collapsing, however, and thereby holds the bridgingmember 3 in circuitclosing position indicated, by the I latch 6 engagingthe pin or roller 7 carried by the toggle link or lever member 25, andpivoted to a bracket secured upon base 13, the latch thus locking theswitching mechanism in circuit closing position. Coacting with theelectromagnet whose winding is 32 is the pivoted armature 33 carryingthe transversely extending bar 8 having at its end adjacent the breakerA the lug 9 adapted to engage and actuate the tail 10 upon the latch 6.

The operating arm link structure 25 and carries the pin 29 upon which ispivoted roller 30, which latter is in- 28 includes the toggle sulated,preferably by insulating the pin 29,

if desired. Between the roller 30 and the operating arm may be disposedthe shield member 31, of insulating material.

Co-acting with the armature 33 of the electro-magnetis the pivoted lever36 adapted to raise the armature 33 and trip the latches of both breakerarms upon inward movement of the rod 35, which may be occasioned at thewill of the operator by pressing in upon the aligned push button member34 carried by the door 37 of the metal box or housing H secured to thebase '13.

The resetting mechanism is mounted on a pivot 38 on the door 37 pivotedto the'hous- 411g H at 37*. I prefer to use two resetting arms, ratherthan one only. in order to reduce the extent of throw required. 1 Thepivot 38 therefore carries diverging oppositely-directed resetting arms39, 40 supporting rollers 41,- 42, the arms and rollers preferably beinginsulated from'the pivot 38. The arms are actuated by a resettinghandle43,'so that oscillation of the arms in counter-clockwisedirection, as viewed in Figs. 2 and 4, will engage the roller 41 ofresetting arm 39, with the roller 30 of operating arm 28 of breaker A;and clockwise movement of the resetting mechanism will cause the roller42 of resetting. arm 40 to engage the roller 30' of operwhich theflattened inner ends of the resetting arms 50 are secured. The flange 48is shown as of triangular shape and as extended sufliciently to providetwo points of attachment for each resetting arm at 51, 51'. Insulationis provided by separate insulating strips 52 and lining insulating tubes53. The resetting arms terminate in pins 54 upon which are mounted therollers 41, 42-. In the fitting 45 is mounted a pin 55 to which issecured one end of a spring 56 whose oppositeend is fastened to the door37. --The relation of the parts are such a to hold the resetting levernormally in or bias it toward neutral position, as it is seen in Figure2.

In this position, a pin 57, mounted upon fit-.

ting 46 lies in front of an eye 58 secured upon the door, so that a lock59 may be applied through the eye and about the pin to preventunauthorized operation of the resetting lever to reseteither of thecircuit breakers.

The same reason which makes it undesirable to open the door of thecircuit breaker box for switch resetting. makes it desirable also thatthe position of the circuit breakerswhether open or closed,may be seenfrom the outside and my visual indicator is provided for this purpose.

In the form shown, the indicators are opposite counterparts. Eachcomprises a blade 60, pivoted on a pin 61 on door 37. Each blade carriestwo indicators, 62, 63 for observation through an opening 64 in the door37.

The opposite end of each disk is laterally extended at 65 and terminatesin an insulated disk 66 in such position as to be engaged by the rollerupon one of the operating arms 28, 28 when the latter is in the circuitclosing position. The device is weighted so as to lie normally in thedotted line position in' Figure 7, with the lower edge of the bladeresting against a. stop 67 and is moved to the full line position inthat figure when the circuit breaker is closed. These positions areinterpreted by the surface 62 or 63 which shows through opening 64.

Safety in protection against interference with the circuit breaker, aswell as reliab'e operation of the, resetting mechanism require that thedoor of the box be not only closed, but reliably held in closedposition; and the best operation of the resetting mechanism requiresthat the door be tightly closed so that the resetting arms will at alltimes engage the operating arms at the same angle and at the samepositions. For this reason I have provided retaining and lockingmechanism for the door which holds the door tightly closed and looks itthere while freeing the lock from strain by the door upon the resettingmechanism. As it is convenient to hinge the door at the top, so that theresetting mechanism can be turned out of the way as far as possible togive full access to the interior of the box, the closing and lockingmechanism is most conveniently located at the bottom.

Upon the bottom of staple 68 engaged by a hook 69 upon the swinging arm70, carried by the door. The end of the hook is tapered at 71 to engagewith the edge 72 within the staple opening, so as to force the doortight operation. The end of the staple is pierced at 73 to receive apadlock 74 by which the door is locked in closed position.

The operation is as follows:

Vith the breakers A and B in circuit closing position indicated in Figs.1 and 2. upon occurrence of abnormal current flow in the circuit, dueeither to simple overload, short circuit or other condition, theelectro-magnet winding 32 will cause attraction of its armature 33,thereby raising the transversely extending bar 8 causing its abutments 9and 9, associated, respectively, with the latches of the arms A and B,to actuate those latches and free the toggle levers 25 and 25. whereuponthe'movable contact members 3 and 3' will swing on their pivots,separating from the main terminal blocks and so breaking each side ofthe circuit. In so moving to open circuit position the members 25, 25and their associated rollers 30, 30 rotate in counter-clockwisedirection about the pivots 26, 26' to positions indicated, respectively,in side and front views in Figs. 3 and 4.

Or should it be desired in advance of an abnormal electrical conditionin the circuit to trip the apparatus, the push button 34 is pushedinwardly, causing manual actuation of the armature 33 to trip thelatches as above described.

When the breaker mechanism moves to open circuit position the indicatingmembers change position, and the fact that the circuit breakers havemoved to open position is therefore made known by these indicating meanswithout opening the housing structure.

lVhen it is desired to close the circuit the operating handle 43 isswung first in one the box I place a direction, for example,counterclockwise, as

viewed in Fig. 4, whereupon the roller 41 will press downwardly upon theroller 30 of breaker arm A, the force exerted by the operator upon thehandle 43 having to overcome the spring 56 as well as the resistanceoffered by the breaker mechanism. Eventually the breaker arm A reachesand is latched in circuit closing position indicated in Fig. 1. Thecircuit is now still open, because the breaker arm B is open. It may beclosed by allowing handle 43 to return to normal position and thenswinging it in clockwise direction causing roller 42 to press downwardlyupon roller 30 and so move the arm A to circuit closing position andlatch it,

shut by wedge the spring 56 again being extended in this closingmovement. Upon release of the handle 43 the spring 56 will contract andso return the resetting mechanism to its neutral or normal positionindicated.

ll in so moving the second arm B to circuit closing position an abnormalelectrical condition obtains in the circuit, immediately the fixed andmovable contacts engage each other the circuit will be closed, becausearm A has previously been closed, and there will occur an abnormal flowof current which will again sulilciently energize the magnet 32 toattract its armature 33 and actuate both latches, breaker arm- A thenbeing tripped and flying to open position while the operator is stillattemi'iting to close the breaker l3, and the circuit is again open orbroken. A

Assuming the housing H to have been opened for any reason, to close itthe door is closed and locked with the circuit breakers, let us say, inopen position, corresponding with the dotted position of the indicatorin Figure i'. The resetting mechanism is locked in neutral position. When it is desired to reset the circuit breakers, the lock 59 must firstbe opened, after which the resetting arm is oscillated alternately inopposite directions, resetting first one and then the other of thecircuit breakers A and B without regard to the order in which they areset, as above described. Since indicators are provided for the positionof the circuit breaker operating arms, either one can be reset, where italone has been opened, with out going through the form of resetting theother. t

It will be noted that the operation does not require opening of the doorand that the position of the switches can be told at a glance b lookingat the indicators.

It wil be noted that the circuit breakers and resetting mechanism areentirely distinct and separate "from each other and re quire no furtheraccommodation to each other than POSitlOIllllQ to inter-fit their arcsof'movement, the rol ers mounted upon the ends of the arms, thoughdesirable, not affecting the main principles of the invention.

Other forms of my invention will suggest themselves to the engineer andothers skilled in this art, ditl'ering in appearance, location andvarious characteristics from the example illustrated, but equally withinthe spirit and scope of my claims.

Certain of the subject matter herein disclosed is disclosed andclaimed'in my prior Letters Patent No. 1,389,996, September 6, 1921.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patenet is:

1. In combination,

automatic circuit m nses breaker mechanism comprising movable contactmembers, a latch for each of said contact members locking the same incircuit closing position, a member common to said latches for trippingthem, automatic tripping mechanism, a n'iovable support, means indetached relation to said contact members carried by said support andoperable in opposite directions for resetting said contact members insuccession, and a manually operable tripping member independent of saidmeans and carried by said support in detached relation to said commontripping member for actuating it.

2. in a resetting mechanism for circuit breakers and other switches, aswitch, an operating lever therefor, a box enclosing the switch andhaving a movable cover, a resetting mechanism tor the switch carried bythe cover and movable, when the cover is in closed position. through thepath of movement of the operating lever, and wedge-tastening mechanisminsuring complete closure of the cover and the operative positioning ofthe resetting lever.

3. in a resetting mechanism for circuit breakers and other switches, aswitch, an operating lever therefor, a box enclosing the switch andhaving a swinging cover, a resetting mechanism for the switch carried bythe cover and movable, when the cover is in closed position, through thepath of movement of the operating lever, a wedge hook carried by thecover, and an eye engaged by the hook to wedge the cover shut and insureoperative positioning of the resetting lever.

ln a'resetting mechanism for circuit breakers and other switches,switch, an

operating lever therefor, a box enclosing the switch and having aswinging cover, a resetting mechanism for the switch carried by thecover and movable, when the cover is in closed position, through thepath of move ment of the operating lever, a wedge hook carried by thecover, a fixed member engaged by the hook to wedge the cover shut andinsure operative positioning of the resetting lit) lever, and a lockthrough the hook to prevent withdrawal thereof.

The combination with a base, of an electric switch thereon, means forrestraining said switch in normal position, a magnet arn'iature foractuating said restraining means to trip said switch, a member carriedby said base for mechanically actuating said armature to trip saidswitch, an enclosing housing, a second member carried by and movablewith respect to said housing for actuating said first member, and athird member carried by and movable with respect to said housing foractuating-said second member.

6. The combination with a base, of an electric switch thereon, means forrestraining said switch in normal position, a magnet armature foractuating said restraining means to trip said switch, a member carriedby said base for mechanically actuating said armature to trip saidswitch, an enclosing housing, a second member carried by and movablewith respect to said housing for actuating said first member, saidhousing having a wall carried by and movable with respect to saidhousing, and a third member carried by said movable wall for actuatingsaid second member.

7. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing the aforesaidstructure, a housing wall pivoted upon said housing, and resettingmechanism detached from, said switch members for resetting themsuccessively carried by said pivoted housing wall and having an arcuatepath of movement to and away from operative position with respect tosaid switch members.

8. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal osition, automatictripping mechanism t erefor, a housing enclosin the aforesaid structure,a housing wall pivoted upon said housing, and resetting mechanismdetached from said switch members for resetting them successively bymovements in different directions carried by said pivoted housing walland having an arcuate path of movement to and away from operative posi-'tion with respect to said switch members.

9. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing the aforesaidstructure, a housing wall pivoted upon said housing, resetting mechanismdetached from said switch members for resetting them successivelycarried by said pivoted housing wall and having an arcuate path ofmovement to a] d away from operative position with respect to saidswitch members, and manually operated tripping means independent of saidresetting mechanism carried by said pivoted wall in detached relation tosaid restraining means for actuating sad restraining means independentlyof movement of said resetting mechanism.

10. Automatic circuit breaker mechanism comprising independently movableswitch members. means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing the aforesaidstructure, a housing wall pivoted upon said housing, resetting mechanismdetached from said switch members for resetting them successively bymovements in different directions carried by said pivoted housing walland having an arcuate path of movement to and away from operativeposition withrespect to said switch members, erated tripping meansindependent of. said resetting mechanism carried by said pivoted wall indetached relation to said restraining means for actuating saidrestraining means independently of movement of said resetting mechanism.

11. Automatic circuit breaker mechanism comprising independently movableswitch arms, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing the aforesaidstructure, resetting mechanism carried by said housing in detachedrelation to said switch arms for resetting them successively, andmanually operated tripping means independent of said resetting mechanismcarried by said housing in detached relation to said restrainingmeans-for actuatin said restraining meansindependently of movement ofsaid resetting mechanism.

12. Automatic circuitbreaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing the aforesaidstructure, a housing wall pivoted upon said housing, resetting mechanismdetached from said switch members for resetting them successivelycarried by said pivoted housing wall and having an arcuate path ofmovement to and away from operative position with respect to said switchmembers, a spring attached to said resetting mechanism and to saidpivoted wall for biasing said resetting mechanism to normal position,

means for locking said resetting mechanism in said normal position towhich biased by said spring, and manually operable tripping meansindependent of said resetting mechanism carried by said pivoted wall indetached relation to said restraining means for actuating saidrestraining means independently of movement of said .resetting mechanismwhen said resetting mechanism is locked.

13. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem,

and means for locking said resetting inechanism in fixed position tosaid support.

14. Automatic circuit breaker mechanismcomprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism 1 therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem successively by movements in difi'erent directions, and means forlocking said resetting 130 and manually op-' mechanism in fixed positionto said support.

15. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthein, means for locking said resetting mechanism in. fixed position tosaid support, and means for locking said support against movement awayfrom said circuit breaker mechanism.

16. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem successively by movements in different directions, means forlocking said resetting mechanism in fixed position to said support, andmeans for locking said support against movement away from said circuitbreaker mechanism.

17. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem, a spring attached to said resetting mechanism and to said support"for biasing said resetting mechanism toward inoperative position, andmeans for lockingsaid resetting mechanism in said inoperative position.w 4

18. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem successively by movements in different directions, a springattached to said resetting mechanism and to said support for biasingsaid resetting mechanism toward inoperative position, and means forlocking said resetting mechanism in said inoperative position.

19. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detach-ed relation to said switch members for resettingthem, a spring attached to .said resetting mechanism and to said supportfor biasing said resetting mechanism toward inoperative position, meansfor locking said resetting mechanism in said inoperative position,

and manually operable tripping means independent of said resettingmechanism carried by said support in detached relation to saidrestraining means for actuating said restraining means independently oimovement of said resetting mechanism.

20, Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem successively by movements in different direc tions, a springattached to said resetting mechanism and to said support for biasingsaid resetting mechanism toward inoperative position, means for lockingsaid resetting mechanism in said inoperative position, and manuallyoperable tripping means independent oi said resetting mechanism carriedby said support in detached relation to said restraining means toractuating said restraining means independently of movement of saidresetting mechanism.

21. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a support, resetting mechanism carried bysaid support in detached relation to said switch members for resettingthem, a spring attached to said resetting mechanism and to said supporttorbiasing said resetting mechanism toward inoperative position, meansfor locking said resetting mechanism in saidninoperative position,manually operable tripping means independent of said resetting mechanismcarried by said support in detached relation to said restraining meansfor actuating said restraining means independently of movement of saidresetting mechanism, and means for locking said support in position inwhich said resetting mechanism and said manually operable tripping meansare disposed in their operative positions with respect to said switchmembers and said restraining means, respectively,

22. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them .in normal position,automatic tripping mechanism there-tor, a support, resetting mechanismcarried by said support in detached relation to said switcli members forresetting them successively by movements in (litter-entdirections, aspring attached to said reset ting mechanism and to said support forbiasing said resetting mechanism toward inoperative position, means forlocking said resetting mechanism in said inoperative position, manuallyoperable tripping means independent of said resetting mechanism carriedby said support in detached relation to having an aperture for each ofsaid switch members, resetting mechanism detached from said switchmembers for resetting them carried by said housing, and indicatorscoacting with said apertures and movable in unison with said switchmembers under control of said resetting mechanism for indicating theposition of said switch members.

24. Automatic circuit breaker-mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a'housing enclosing said ci r--- cuitbreaker mechanism, said housing having an aperture for each of saidswitch members, resetting mechanism detached from said switch membersfor resetting them successively by movements in different directionscarried by said housing, and members for indicating the positions ofsaid switch members actuated in succession by said resetting mechanismand visible through said apertures.

25. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing said circuit breakermechanism, said housing having an aperture for each of said switchmembers, resetting mechanism detached from said switch members forresetting them carried by said housing, and indicators carried by saidhousing in detached relation to said switch members and movable inunison therewith with respect to said aper-i tures.

26. Automatic circuit breaker mechanism comprising independently movableswitch members, means for restraining them in normal position, automatictripping mechanism therefor, a housing enclosing said circuit breakermechanism, said housing having an aperture for each of said switchmembers, resetting mechanism detached from said switch members forresetting them carried by said housing, and indicators pivoted on saidhousing in detached relation to said switch members and movable inunison therewith with respect to said apertures. 27. Automatic circuitbreaker mechanism comprising independently movable switch members, meansfor restraining them in I normal position,'automatic tripping mecha nismtherefor, a housing enclosing said circuit breaker mechanism, saidhousing having an aperture for each of said switch members, resettingmechanism detached from said switch members for resetting them carriedby said housing, and indicators pivoted on said housing indetached relation to said switch members and movable in unison therewith with respectto said apertures, each of said indicators biased to--- ward oneindicating position and actuated by movement of one of said switchmembers to a different indicating position.

28. The combination with movable contact structure and restraining meanstherefor, of an enclosing housing, resetting mechanism carried by saidhousing and operable from the exterior thereof for moving said contactstructure to circuit closingposition, means for preventing circuitclosure by said contact structure when'actuated by said resettingmechanism during existence of a predetermined electrical condition, andmanually operated tripping means independent of said resetting mechanismcarried by said housing in detached relation to said restraining meansfor actuating said restraining means independently of movement I of saidresetting mechanism to trip said contact structure.

29. The combination with movable contact structure and restraining meanstherefor, of an encloslng housing, resetting mech-' anism carried bysaid housing in detached relation to said contact structure and operablefrom the exterior of said housing for moving said contact structure tocircuit closing position, means for preventing circuit closure by saidcontact structure when actuated by said resetting mechanism duringexistence of a predetermined electrical condi tion, and manuallyoperated tripping means independent of said resetting mechanism carriedby said housing and operable from the exterior thereof for actuatingsaid restraining means independently of movement of said resettingmechanism for tripping said contact structure.

30. The combination with movable contact structure and restraining meanstherefor, of an enclosing housing, a housing wall pivoted on saidhousing, resetting mechanlsm carried by said pivoted housing wall andoperable from the exterior thereof for moving said contact structure tocircuit closing position, means for preventing circuit closure by saidcontact structure when actuated by said resetting mechanism duringexistence of a predetermined electrical condition, and manually operatedtripping means sition, means for preventing circuit closure by saidcontact structure when actuated by said resetting mechanism duringexistence of a predetermined electrical condition, means for lockingsaid resetting mechanism to said pivoted housing wall in inoperativeposition with respect to said contact structure, and means for lockingsaid housing wall.

39. The combination with movable contact structure and restraining meanstherefor, of an enclosing housing, resetting mechanism carried by a wallof said housing in detached relation to said contact structure andoperable from the exterior for moving said contact structure to circuitclosing position, means for preventing circuit closure by said contactstructure when actuated by said resetting mechanism during existence ofa predetermined electrical condition, means for locking said resettingmechanism to said housing wall in inoperative position with respect tosaid contact structure, manually operated tripping means carried by saidhousing and operable from the exterior for actuating said restrainingmeans independently of movement of said resetting mechanism for trippingsaid contact structure, and means for locking said housing wall.

40. The combination with movable contact structure and restraining meanstherefor. of an enclosing housing, resetting mechanism carried by a wallof said housing in detached relation to said contact structure andoperable from the exterior for moving said contact structure to circuitclosing position, means for preventing circuit closure by said contactstructure when actuated by said resettingmechanism during existence of apredetermined electrical condition, means for locking said wall, and

manually operated tripping means carried by said housing and operablefrom the exterior thereof for actuating said restraining meansindependently of said resetting mechanism for tripping said contactstructure.

41. The combination with movable contact structure and a latch forrestraining it in circuit closing position,-of an enclosing housing,resetting mechanism operable from the exterior of said housing formoving said contact structure to circuit closing position, means forpreventing circuit closure by said contact structure when actuated bysaid resetting mechanism during existence of a predetermined electricalcondition, and manually operated tripping means independent of saidresetting mechanism carried by said housing in detached relation to saidlatch for actuating said latch independently of movement of saidresetting mechanism to trip said contact structure.

42. The combination with movable contact structure and restraining meansthere for, of an enclosing housing, resetting mechanism carried by saidhousing in detached relation to said contact structure and operable fromthe exterior of said housing for moving said contact structure tocircuit closing position, means for preventing circuit closure by saidcontact structure when actuated by said resetting mechanism duringexistence of a. predetermined electrical condition, means for lockingsaid resetting mechanism to said housing, and manually operated trippingmeans independent of said resetting mechanism carried by said housing indetached means for actuating said restraining means independently ofsaid resetting mechanism to trip said contact structure.

WILLIAM M. SCOTT.

relation to said restraining

